US81483A - Improvement in low-watee ikdioatoe - Google Patents

Description

@time iuteaatnt THEoDoE e. EI'SWALD AND JAMES BARBoUR, or rRovIDENcE, RHODE ISLAND, `ASSIGNORS TO T. G. EISWALD.

Letters Patent No. 81,483, dated August 25,1868.

'IMPROVEMENT IN LOW-WATER INDICATOR.

TO ALL WHOMIT MAY CONCRN:

Be it known that we, THEODOR Gr. EISWALD and JAMES BARBoUR,-of the city and county of Providence, and State of Rhode Island, have invented a new and improved Low-Water Indicator; and we do hereby declare that the following is a full, clear, and exact description of tbe construction and operation of the sanne, reference being had to the accompanying drawings, making -a part of this specification, in whichv Figure 1 isa longitudinal vertical section.

Figure 2, a horizontal section through line tra ot' iig. 1. v l

The object of thisinvention is so to construct a. lowwater indicator that the fusible plug, when melted, shall not be blown inte the whistle, but shall be forced in another direction, so as to prevent the possibility of its obstructing or interfering with' the operation of the'alarm-apparatus. i

` In the drawings, A represents an expanded andchambered tube, Whichiis attached to the boiler, or to any suitable steamppe, by the connection er. A

B is a tube screwing into the upper end of the chamber A,"a nd G another, screwing into the u`pper`end of tube B, and supporting the whistle D, the whole forming an instrument whose general outlines are represented in iig- 1.5.

' The lower end of -tubeB projects down into the chamberedor expanded portion lof tube A, and there supports a hollow cup, which is suspended from it by ascrew-threa'd connection. A fusible-plug valve,rP, separates the interior of cup E from the interor'oftnbe B, seating downward, as seen in g. 1. The steam from the boiler enters chamber A, and thence passes into the-interior of tube B through an aperture, in the side of the tube. It'cannot thence pass upward tothe whistle, since the upper end of tube B is made solid, and there is' no communicationin that direction between its cavity and the tube vC above it. When the steam Vis superheated, however, from, any canse, it melts and blows out the'plug P, forcing the latter down into the cup E. 4 The steam then-.passes into the cup, and from that escapes through pipes e\e, inthe solid walls of the tube B, and through the upper part of cupNI?` to the cavity of tube C, and thence to the whistle, where vit sounds the'ala'rm. p 'l `i A The whole instrument is exceedingly simple" in construction and eiicient in practical operation, blowing all the material of' the plug to the bottom of cup E, and preserving the whistle in'good working condition at all times, so'that when the plug is blown-out, the whistle never failsI to sound instantly. m

. Having thus described our invention, whatwe claim as new, end desire to secure by Letters Patent, is'- l. The arrangement of the cup E, fusible plug P, tube or stem B, and openings or side pieces ce, or their equivalents, when constructed'to operato in the manner described.

2. The arrangement of the above-described apparatus within the hollow globe,rcylinder, or expanded pipe A, substantially as shown and described. i THEODOR G. EISWALD. [1.. s] JNMES BARBOUR. [L. s.] Witnesses G. W, BLISS,

' EDWIN T. CASE,

CHAs. A..PETTIT,'

SoLoN C. KEMoN.

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