Saturday, February 15, 2014

Nurses', Women's Clothing - WW1

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Open Drawers are drawers (underwear) where the backs and front of the legs are not joined together.

Open Drawers. -- Girls generally began to wear open drawers when they were about nine or ten years old. Open drawers were not cut down at the hips, and the band was made all in one piece of the material. The backs and fronts of the legs were not joined together, but hemmed separately, or lined with false hems. The fronts, in children's sizes, were seamed together for about 2 inches, in women's sizes a little more. A button and buttonhole were placed at the ends of the bands, or two tape strings. The legs could be constructed as for closed drawers, i.e. as knickerbockers with bands, or they could be made up with a deep hem, and narrow tucks above. The drawers were gathered or pleated into the bands at the waist and legs. Women's drawers were very seldom made up as closed, but nearly always as open.

NWU - Navy Working Uniform

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23-8-17 Why the USN Wears Camouflage - BNJ > .
23-12-19 Camouflage - WW2 Doc > .

The Navy Working Uniform (NWU) is a series of military uniforms that are currently used by the United States Navy (and some elements of the U.S. Coast Guard) for wear by its members. The NWU is a "working" uniform, which means that it is made to a more durable and utilitarian standard, thus being worn in lieu of more formal uniforms that might get unduly damaged or dirtied in the process of normal military duties.

The first NWU variant, known as the NWU Type I, was designed in late 2004 and began being used by the U.S. Navy in limited quantities beginning in late 2008. By late 2010, it had completely replaced most other "working" uniforms. Colloquially called both "Blueberries" and "Aqua-flage" (a portmanteau of aquatic and camouflage), it was made of a ripstop cotton–nylon blend and featured a blue and grey camouflage pattern. Though originally intended for shipboard use, the nylon content caused the uniforms to lack sufficient flame resistance for shipboard environments, and it was replaced with flame-resistant coveralls when working shipboard. Due to the unsuitability of its camouflage pattern ashore, the NWU Type I was completely retired from use in 2019, replaced by other variants.

There are currently two variants of the NWU in use by the U.S. Navy for shore environments. The NWU Type II, which has a primarily tan and brown camouflage pattern called AOR1, is designed to be worn in sandy and arid desert battlefield environments, while the NWU Type III, which has primarily green, brown, and black pattern called AOR2, is designed to be worn in more temperate environments such as the contiguous United States.

NWU Type III is now worn by all U.S. Navy personnel. The NWU Type III has been issued to new naval recruits since late 2017 and completely replaced the NWU Type I in 2019 when the latter was discontinued and phased out of service. The NWU Type II is worn only by specialized units such as the Naval Special Warfare Development Group, Navy SEALs, Special Amphibious Reconnaissance Corpsmen, Explosive Ordnance Disposal Technicians, and Seabees when in the appropriate environment.

Tuesday, February 11, 2014

ROC Plotting Instrument, Height Corrector

Observer Corps - ROC ..  

IWM Non Commercial Licence .
A typical mid-war Post Plotting Instrument. Note the two pointers on the map (near the dashed circle), indicating the addition of the Micklethwait Height Corrector. 

A number of details of the post and Post Instrument can be seen in this image. The map on the Post Instrument shows the UK Grid Coordinate system for the area around the post. As the instrument is rotated azimuth and moved in altitude, the pointers move over the map - they are currently pointing near the grey disk just to the left of the large 1 in the centre of the map. This allows the teller to easily report positions without having to calculate them.

On the map are markings for 11 Group and Watford Centre, the reporting chain this post is part of (Watford is a short distance to the southeast, 11 Group covered the Midlands). The large C1 centered on the map is the ID of this post. Four grey disks can also be seen on the map with markings for L2, F3?, C3 and C4. These indicate the location of other nearby posts, and were used with the Micklethwait Height Corrector to calculate the altitude of the aircraft.

Arrows at the edges indicate the direction to two other posts, F2 and D3?, which are off the map area. The dashed ring on the map is the "sound line", used to estimate locations based on sound alone.

The Observer appears to be sighting along the iron sights on the top of the sighting unit, as opposed to using the telescope eyepiece. The walls of the post are printed with numbers representing 600ths of a circle, a short-lived measurement system that was later replaced with angular "mils", 400ths of a circle. Posts were normally manned by two, as in this case, but sometimes included a third who acted as a lookout and helper.

[image] Post Plotting Instrument & Micklethwait Height Corrector

'‘The Observer Instrument Mk 2A, designed by an Engineer named Captain Ball of Hampshire. Part of the instrument comprised ‘The Micklethwait Height Correction Attachment’, which allowed for heights to be corrected between two posts plotting the same aircraft.

The Correction Height Procedure was as follows :-

1. An observer estimated the height of an aircraft and set the height on the height bar.
2. The aircraft was sighted and the grid position shown by the instrument pointer was reported to the Ops Room. It should be noted that the aircraft grid position was only as accurate as the accuracy of the estimated height. It was necessary for at least one other post to carryout this procedure as well.
3. Using cross plotting the Ops Room plotter could ascertain the true position of the aircraft and he would quickly inform the posts of this grid position.
4. The post observer would then slide the Micklethwait cranked pointer on to the true grid position and read off the true height of the aircraft on the Micklethwait Height bar. This would then be set on the instrument height bar for all subsequent plots.

http://www.rocassoc.org/open/items/09/mickle.htm
http://www.roc-heritage.co.uk/post-instrument.html
http://www.roc-heritage.co.uk/uploads/7/6/8/9/7689271/use_of_post_instrument.pdf
https://en.wikipedia.org/wiki/Post_Instrument

sī vīs pācem, parā bellum

igitur quī dēsīderat pācem praeparet bellum    therefore, he who desires peace, let him prepare for war sī vīs pācem, parā bellum if you wan...