Diaphragm masks

Fig. 2-26. In addition to the standard Service Gas Mask, the Chemical Warfare Service also designed diaphragm masks for speaking capability. Note the hood, which covered the skin of the head, face, and neck. The soldier also wears chemically protective gloves. Since the uniform was impregnated with a substance that hindered the penetration of mustard, in theory, no portion of his skin was subject to mustard injury. Photograph Chemical and Biological Defense Command Historical Research and Response Team, Aberdeen Proving Ground, Md.

Creation of the radial distribution of the refractive index is achieved by controlled change of the diaphragm mask size in the chemical reaction/diffiision zone on the surface of polymeric/gel-polymeric film (plate). 

To set the required duration of the process (polymer-analogous transformation/ diffusion copolymerization) in given directions on the surface of the gradient carrier a device is used that allows use of a diaphragm mask in the contact zone of the gradient former with the gradient earrier. Several teehnical solutions of application of such devices have been... 

The Young s modulus of SiC has been measured using load-deflection measurements of suspended 3C-SiC diaphragms and free-standing 3C-SiC cantilever beams [1-4]. All of the samples were grown on Si. The Si substrates were masked and stripped from the back. The temperature coefficient for the Young s modulus was determined to be 3.2x 10 5GPa°C [4]. 

After World War I ended, work at the Edgewood medical research laboratories continued. New gas masks were developed, such as those with high-eyepoint lenses for use with binoculars, and masks with speaker diaphragms. As those who have worn mission-oriented protective posture (MOPP) gear know, one cannot really be heard through a mask. Initially, scientists at Edgewood worked on oilcloth-... 

Levers, diaphragms, shims, gaskets, washers, springs, links, brackets, contacts, connectors, probes, heat sinks, IC lead frames, rotor and stator laminations, iris leaves, graticules, deposition masks, encoder discs, and jewelry... 

The minimum frequency is determined by the size of the central diaphragm (L 1mm) in the mask 5, which blocks the zero order of diffraction and is calculated by the formula Fmm=L/(X f), where A, is a laser wave length, f focal length of the objective 6, and L size of the central diaphragm. 

CWS Equipment Army Exhibit, San Antonio, Texas, March 1942. The masks, from left to right, are diaphragm, service, optical diaphragm (for use... 

CWTC Item 306, Standardization of Mask, Gas, Diaphragm, MIll-IXAI-lVAl, 21 Jan 41. 

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